Method of speed regulation.



No. 851,704. PATENTED APR. 30, 1907. N. W. STORER.

METHOD OF SPEED REGULATION.

APPLICATION FILED JULY24, 1905.

Fig.

INVENTOR W A'TTORNEY Pittsburg,

invrr-nn. s rsrrns NORMAN w. erosion, or r rrsnnne earns; c *ULA, risers-non To INGHOUSE ELECTRIC & lllllNUFA or rENNsYLvAnIA;

mETHoo oF sense secretaries 1'0 alZ whom it may concern:

Be it known that I, NORMAN W. Sronnn, a citizen of the United States, and a resident of in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Methods of Speed Regulation, of which the following is a specification.

My invention relates to methods of regulating the speeds of vehicles or machines that are driven by electric motors, and it has for its object to rovide a method of speed control that shal insure an increase in the ethciency of operation of the motors and of the system of distribution over the efiiciencies heretofore obtained in practicing other methods.

such a method.

The most practical method heretofore employed for regulating the speeds of vehicles or machines driven by seriesmotors consists connecting the motors in series relation for starting and slow speed running conditions and in parallel relation for full speed running conditions, intermediate speeds being ohtained by varying the amount of resistance in r the Ymotor circuit. Since energy is wasted when regulating resistance is connected in the circuit, the only conditions of eiiicient operation when practicing this method are when the motors are connected either series or in parallel without resistance in the circuit. Under these conditions the motors are obliged to meet all contingencies that arise, and since they are generally geared so as to meet the -maximum speed conditions necessary to maintain a desired or required schedule,'very inefficient operation results at slow speeds and wherever frequent stops are made. Locomotives and cars for most in terurbanrailway systems are required to op erate under these conditions, and it is therefore desirable that a method of seed control be employed which shall provi e more eflicient operation under all conditions than can be obtained in practicing the usual seriesparallel method.

-' It is the object of in the accompanying drawings, Figure 1 illustrates, diagralmnatically, the essential successive relations of the motors one to an- Specification of Letters Patent.

Application filed July 2 1, 1965. Serial llo. 271,066.

changed my invention to provide 'Eatented April so, ice-r.

. cui /l-PANY, A CGRPORATlQN other from starting to speed running con v ditions, when connected in accordance with my invention, and Fig. 2 illustrates a modification of the conditions shown'in Fig.1.

My nvention is especially adapted for use on cars having four axles to which motors may he geared, and when so applied, two or the motors should havesuihcient capacity to operate the cars at the desired :lull speed and should be constructed to receive the full voltage of the supply conductors, and the other two motors should be smaller and should preferably be adapted to operate upon a lower voltage than that existing between the supply conductors. For example, the larger motors may be of eighty horse-power capacity the smaller motors of twenty horse-power capacity, t e voltage of the larger motors being normally five hundred and that of the smaller motors one hundred and twenty-five. in starting, the smaller motors should be comected in series with the larger motors and should be removed from the circuit consecutively in order to eilect ac celeration in speed. When thelarger motors are changed from series relation to parallel relation, the smaller motors should also be from series relation to parallel relation, and. order to eilect further acceleration in speed, should be removed from the circuit -for the final step.

in Fig. are shown thevarious steps in the method of operation just described, and for purposes of explanation, it may he assumed that the voltage of the supplycn'cuit ,(not shown) to which the motors are connected is iive hundred. The larger motors 1' and 2 may be assumed to be constructed for" normal operation on five hundred volts and the smaller motors 3 and efor normal operation on one hundred and twentyfive volts. The motors are first connected all in series, as shown at a, two hundred volts being'then supplied to each of. the larger motors and fifty volts to each of the smaller motors. in the next step, one of the smaller motors is out out of circuit and approximately two' hundred and twenty-two volts will then, be supplied to each of the larger motors and fifty-six volts to the remaining smaller motor. W hen the two larger motors areconneeted in series alone, as shown at 0, two hundred and fifty volts is applied to each. As shown at d,

a larger and a smaller motor are connected in series to constitute a set and the'two sets are connected in parallel relation, the voltage applied to each of the larger'motors being four hundred while that a plied to each of the smaller motors is one l iundred. In the final step, shown at e, the larger motors are connected in full parallel relation and five hundred volts will then be applied to each of them.

If it is'desired to provide more running positions, the connections of the armatures'of the smaller motors may be reversed and the motors connected in series with the larger motors, so that they may operate as boosters and raise the voltage applied to the lar er motors. If the smaller motors are in tais manner converted into boosters, two additional voltage steps may he provided be-.

tween those shown at c and d inl ig. l, which correspond to those shown at it andic, re-

spectively, in Fig. 2. These new ste s are 5 indicat -cl i and jin Fig. 2 and the voltages applies to the larger motors will be greater than two hundred and fifty and less than four hundred, the voltage when only one of the smaller motors acts as a booster, as indicated i, being less than when both motors act boosters. The smaller motors may also act as boosters when the larger motors a connected in parallel relation, such a conion being shown .at m in Fig. 2. 'lhe vold to the motors in this case i t of the supply circuit. v invention has special application to re locomotives having two or more l iving axles and two or more auxiliary axles, in which the larger motors may to the larger driving axles the motors may be geared to the auxil- :n this manner, the total weight locomotive will be carried upon drivieels and a much larger tractive efi'ort oe exerted by such a locomotive than as l eretofore n possible.

iklvklar .i e have shown anc described my me on as applied to the control of two large 5 a o small motors, i desire to be underany other number of motors ms: oiled accordance therewith and large thesmall riotors clifimber. The arrangement conof the motors may also variec at has been specifically shown and eel, and normal operating voltages arger and smaller motors may'assume lesired ratio other what has been For example, two large and 1 small motors may he employed, the smaller motors osing constructed to onerate 1 J0 o no smaller motors may be connected llel and controlled as motor,

g a n .A 4 onean tne voltage or i/l'lS larger motors.

motors may even operate at the same voltage as the largermotors, if desired.

1 claim as my invention: v,

1. The method of speed regulation which consists in connecting a large capacity motor in series with a small capacity motor, removing the small capacity motor from the circuit and so reconnecting said small capacity motor in circuit that it will operate as a booster.

2. The method of speed re lation which consists in connecting a plurality of large capacity motors in series with a plurality of small capacity motors, removing the small capacity motors from the circuit, connecting the large capacity motors in series with cer tain of the small capacity motors and in parallel relation to each other, and again removing the small capacity motors from the circuit;

3. The method of speed regulation. which consists in connecting a plurality of large capacity, hi -h vbltage motors in series with a corresponding number of relatively small ca-- p'acity, low voltage motors, removing the small capacity, low voltage motors from the circuit, connecting the large capacity motors in series with the corresponding small capacmotors and in parallel relation to each other, and again removing the small capacity meters from the circuit.

ihe method of speed regulation which consists in ccrmecting a plurality of large capacity, high motors in series with plurality of small capacity, low voltage motors, removing the sm l capacity meters from circuit, connec -ag the large capacity motors in serie with corresponding small capacity motors and in parallel relation each other, and again removing the small capacity motors from the circuit.

5. L is method of speed regulation which consists in connecting a plurality of large ca-- pacity motors in series with a plurality of small capacity motors, removin capacity motors i cm the circuit, connecting the large capacity motors in series with certain of the small capacity motors and ch g mg the circuit relations the large capacity motors, rein g the small cap-acw a a.

icy motors LiOLll e circuit.

6 ice in teen eneec *egnlation win e log a plurality of large caacitlug. voltage motors i series with a corresponding number of rel ely small capacity, low voltage motors, removing the capacity, low voltage core om the circuit, changing the relations of he large capac1ty motors respect to other and connec g them m series with eerie-- spen ing s capacity motors, and again remoying the small capacity motors irom circuit.

r Y. The method of sneed regulatio; consists COEaGCtlEf; 5. pluralityo m 1 1" the small tage motors in series with a plurality of low vo tage motors, removing the low voltage motors from the circuit, changingthe circuit relations of the high voltage motors with respect to each other, connecting them in ser1es With certain of the low voltage motors, and again removing the low voltage motors from the circuit.

8. The method of speed regulation which consists in connecting a plurality of high volta e motors in series with a plurality of low vo tage motors, removing the low voltage motors from the circuit, so re-connecting the lowvoltage in circuit that they will operate as boosters, again removing the low voltage motors from the circuit, changing the circuit relations of the high voltage motors with respect to each other and connecting them in circuit with the low voltage motors, again removing the low voltage'motors from the circuit, and again so re-connecting the low voltage motors in circuit that they will operate as boosters.

9. The method of speed regulation which consists in connecting a plurality of large capacity motors in suitable circuit relations with a plurality of small capacity motors, then altering the circuit relations of the motors and finally removing one or more of the small capacity motors from the circuit in accordance with the desired conditions of speed regulation.

In testimony whereof, I have hereunto subscribed my name this 18th day of July 1905.

NORMAN W. STORER.

Witnesses F. E. WINNIE, BIRNEY HINES. 

